YB1508
Step-up DC-DC Converter , White LED Driver
Absolute Maximum Ratings
SW voltage
All other pins
40V
10V
Maximum Junction Temp,Tj
Lead Temperature (Soldering 10
sec)
150 °C
300 °C
195 °C
Thermal Resistance
Electricity Characteristics
Table 3：(TA=25°C, Vin=3.3V Cin=1uF Cout=4.7uF unless otherwise noted)
Function Parameter
Conditions
Min
Typ
Max
Units
Input Voltage Range
2.7
9
V
Iout =20mA, Vout = 12.5V
Circuit of figure 1. (L=22uH
Cout =4.7uF)
Feedback Voltage
180
2
200
220
20
mV
Rfb = 10 ohms
FB Pin Bias current
Supply current
10
3.5
1
μA
mA
μA
Vfb = 0.3V
CTRL = 0V
Switching Frequency
Maximum Duty Cycle
Minimum duty cycle
Switch Vcesat
0.7
20
0.8
1.3
93
35
MHz
%
25
200
250
1
%
At Isw = 200mA
40% duty cycle
Ctrl = 0.3V
mV
mA
μA
V
Switch Current Limit
Switch Leakage Current
VCTRL for Full LED current
CTRL Pin Bias Current
Chip turn off delay
1.6
1.7
20
1.8
30
Ctrl = 2V
μA
μS
YB1508
36
21
Over Voltage Protection
V
YB1508P
YB1508 MRev1.4
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